During inspiration, the diaphragm:
Correct answer: A. Contracts
- A. Contracts
- B. Relaxes
- C. Contracts and relaxes
- D. None of these options is correct
Explanation
Inspiration is the first phase of breathing, in which we inhale air.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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